342 . CiTRINODONTID^'. 



5. Poecilia chisoyensis. 

 We know this species from the male sex only. 



D. 9-10. A.?. L. lat. 29. L. transv. 9. 



Tlie height of the body is contained thrice and a third in the total 

 length (without caudal), the length of the head foiu* times and a 

 third ; the free portion of the tail is elevated, its least depth being 

 two-thirds of its own length, and more than the length of the head, 

 without snout. The diameter of the eye equals the length of the 

 Bnont, is two-sevenths of that of the head, and more than one-half 

 of the width of the interorbital space. Origin of the dorsal fin nearer 

 to the occiput than to the root of the caudal, behind that of the anal, 

 above the twelfth scale of the lateral line. Dorsal fin higher than 

 long, but its longest ray is shorter than the head. The enlarged 

 anal ray without terminal appendage. There are eight longitudinal 

 series of scales on each side of the tail. Caudal rather short, its 

 basal half covered with scales. Uniform greenish, with golden re- 

 flections ; dorsal and caudal black. 



Eiver Chisoy, Yera Paz. 



a-c. Males, 3g inches long. From the Collection of Messrs. Godman 

 & Salvin. 



6. Pcecilia elongata. 

 Known from a female only. 



D. 9. A. 8. L. lat. 30-32. L. transv. 9. 



The height of the body is contained four times in the total length 

 (without caudal), the length of the head four times and a third. The 

 free portion of the tail is elevated, its least depth being contained 

 once and two-thirds in its own length, and a little less than the 

 length of the head, without snout. The diameter of the eye equals 

 the length of the snout, is two-sevenths of that of the head, and 

 more than one-half of the width of the interorbital space. Snout 

 much depressed. Lower jaw with a single series of very small teeth 

 only ; and also in the upper the posterior band of villiform teeth is 

 very indistinct. Origin of the dorsal fin nearer to the root of the 

 caudal than to the occiput, a little behind that of the anal, above the 

 fourteenth scale of the lateral Hue. Dorsal fin higher than long, its 

 longest ray being as long as the head, without snout. Anal small. 

 There are eight longitudinal series of scales on each side of the tail. 

 Caudal roxmded, its base only covered with scales. Uniform green- 

 ish ; the membrane of the pouches of scales with a black margin. 

 Fins immaculate. 



Panama. 



a. Female, 5 inches long. Presented by Capt. Dow. 



7. Poecilia petenensis. 



D. 11. A. 8. L. lat. 29-30. L. transv. 8-9. Vert. 16/14. 

 The height of the body (measured below the anterior dorsal rays) 



